Exposes geocoder providers in public geocoder functions

Add config function in postgres explicitly to get MapzenGeocoderConfig.
Bump versions for client and server APIs. New MapzenGeocoderConfig
included to be able to use current QuotaServices with non-configured
users.

server/extension/old_versions/cdb_dataservices_server--0.10.0--0.9.0.sql

@@ -0,0 +1,5 @@
+--DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
+-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION cdb_dataservices_server UPDATE TO '0.9.0'" to load this file. \quit
+DROP FUNCTION IF EXISTS cdb_dataservices_server._OBS_GetMeasureById(text, text, text, text, text, text);
+DROP FUNCTION IF EXISTS cdb_dataservices_server.OBS_GetMeasureById(text, text, text, text, text, text);

server/extension/old_versions/cdb_dataservices_server--0.9.0--0.10.0.sql

@@ -0,0 +1,54 @@
+--DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
+-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION cdb_dataservices_server UPDATE TO '0.10.0'" to load this file. \quit
+
+CREATE OR REPLACE FUNCTION cdb_dataservices_server._OBS_GetMeasureById(
+  username TEXT,
+  orgname TEXT,
+  geom_ref TEXT,
+  measure_id TEXT,
+  boundary_id TEXT,
+  time_span TEXT DEFAULT NULL)
+RETURNS NUMERIC AS $$
+  CONNECT cdb_dataservices_server._obs_server_conn_str(username, orgname);
+  SELECT cdb_observatory.OBS_GetMeasureById(geom_ref, measure_id, boundary_id, time_span);
+$$ LANGUAGE plproxy;
+
+CREATE OR REPLACE FUNCTION cdb_dataservices_server.OBS_GetMeasureById(
+  username TEXT,
+  orgname TEXT,
+  geom_ref TEXT,
+  measure_id TEXT,
+  boundary_id TEXT,
+  time_span TEXT DEFAULT NULL)
+RETURNS NUMERIC AS $$
+  from cartodb_services.metrics import QuotaService
+
+  plpy.execute("SELECT cdb_dataservices_server._connect_to_redis('{0}')".format(username))
+  redis_conn = GD["redis_connection_{0}".format(username)]['redis_metrics_connection']
+  plpy.execute("SELECT cdb_dataservices_server._get_obs_config({0}, {1})".format(plpy.quote_nullable(username), plpy.quote_nullable(orgname)))
+  user_obs_config = GD["user_obs_config_{0}".format(username)]
+
+  quota_service = QuotaService(user_obs_config, redis_conn)
+  if not quota_service.check_user_quota():
+    plpy.error('You have reached the limit of your quota')
+
+  try:
+      obs_plan = plpy.prepare("SELECT cdb_dataservices_server._OBS_GetMeasureById($1, $2, $3, $4, $5, $6) as measure;", ["text", "text", "text", "text", "text", "text"])
+      result = plpy.execute(obs_plan, [username, orgname, geom_ref, measure_id, boundary_id, time_span])
+      if result:
+        quota_service.increment_success_service_use()
+        return result[0]['measure']
+      else:
+        quota_service.increment_empty_service_use()
+        return None
+  except BaseException as e:
+      import sys, traceback
+      type_, value_, traceback_ = sys.exc_info()
+      quota_service.increment_failed_service_use()
+      error_msg = 'There was an error trying to use OBS_GetMeasureById: {0}'.format(e)
+      plpy.notice(traceback.format_tb(traceback_))
+      plpy.error(error_msg)
+  finally:
+      quota_service.increment_total_service_use()
+$$ LANGUAGE plpythonu;